20442691 has 2 divisors, whose sum is σ = 20442692. Its totient is φ = 20442690.

The previous prime is 20442661. The next prime is 20442707. The reversal of 20442691 is 19624402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20442691 - 2⁵ = 20442659 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20442661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10221345 + 10221346.

It is an arithmetic number, because the mean of its divisors is an integer number (10221346).

Almost surely, 2^20442691 is an apocalyptic number.

20442691 is a deficient number, since it is larger than the sum of its proper divisors (1).

20442691 is an equidigital number, since it uses as much as digits as its factorization.

20442691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 20442691 is about 4521.3594194667. The cubic root of 20442691 is about 273.4299111755.

The spelling of 20442691 in words is "twenty million, four hundred forty-two thousand, six hundred ninety-one".